Q. 254.0( 17 Votes )
Draw one of the g
Geometrical isomerism occurs in heteroleptic coordinate complexes due to the different possible geometric arrangements of ligands. The geometrical isomers of the given complex are in trans and cis forms. The optical inactive version is the trans isomer as the mirror image of the complex is superimposable.
The name of this complex is Dichloridobis(ethane-1,2-diammine)platinum(IV) ion.
This complex is named by IUPAC nomenclature as follows: For the compound, the platinum Pt has oxidation number as +4. So Platinum(IV) is the base name. There are two ethane-1,2-diammine ligands and two Cl- ligands. Cl- is named as chlorido. The ligands are placed in alphabetical order and is named as Dichloridobis(ethane-1,2-diammine)platinum(IV) ion. The charge of the ion is +2 because the overall charge of Co+4, en and Cl- is +2.
Valence bond theory states that, “the metal atom or ion under the influence of ligands can use its (n-1)d, ns, np or ns, np, nd orbitals for hybridization to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, square planar and so on.” The bonding in [Co(NH3)6]3+ can be given on the basis of VBT.
In the complex, [Co(NH3)6]3+, the cobalt ion is in +3 oxidation state and has the electronic configuration 3d6. Six pairs of electrons, one from each NH3 molecule, occupy the six hybrid orbitals. Thus, the complex has octahedral geometry and is diamagnetic because of the absence of an unpaired electron. To deduce the spin of the entity, since the inner d orbital (3d) is used in hybridisation, [Co(NH3)6]3+ is called an inner orbital or low spin or spin paired complex.
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